Microwave-Assisted Hydrothermal Synthesis of Ceric-Ammonium Phosphates (NH4)2Ce(PO4)2⋅H2O and NH4Ce2(PO4)3

I. V. Tronev; Тронев И. В.; E. D. Sheichenko; Шейченко Е. Д.; L. S. Razvorotneva; Разворотнева Л. С.; E. A. Trufanova; Труфанова Э. А.; P. V. Minakova; Минакова П. В.; T. O. Kozlova; Козлова Т. О.; A. E. Baranchikov; Баранчиков А. Е.; V. K. Ivanov; Иванов В. К.

doi:10.31857/S0044457X22601869

Microwave-Assisted Hydrothermal Synthesis of Ceric-Ammonium Phosphates (NH4)2Ce(PO4)2⋅H2O and NH4Ce2(PO4)3

Authors: Tronev I.V.¹^,2, Sheichenko E.D.¹^,2, Razvorotneva L.S.¹^,2, Trufanova E.A.¹^,2, Minakova P.V.¹^,2, Kozlova T.O.¹, Baranchikov A.E.¹, Ivanov V.K.¹^,2
Affiliations:
1. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences
2. National Research University Higher School of Economics
Issue: Vol 68, No 3 (2023)
Pages: 318-324
Section: СИНТЕЗ И СВОЙСТВА НЕОРГАНИЧЕСКИХ СОЕДИНЕНИЙ
URL: https://journals.rcsi.science/0044-457X/article/view/136328
DOI: https://doi.org/10.31857/S0044457X22601869
EDN: https://elibrary.ru/JEWBVV
ID: 136328

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Abstract

The possibility of preparation of crystalline double cerium(IV) phosphates (NH4)2Ce(PO4)2⋅H2O and NH4Ce2(PO4)3 under the conditions of microwave-assisted hydrothermal synthesis has been analyzed. It has been shown that these phosphates in a single-phase state can be obtained in the temperature range of 130–190°С with a synthesis duration of ≥5 min, while the phase composition of the synthesis products is determined by the molar ratio of ammonia and phosphoric acid in the reaction mixture. Short-term (5 min) low-temperature (130°С) hydrothermal synthesis under microwave heating leads to the preparation of (NH4)2Ce(PO4)2⋅H2O and NH4Ce2(PO4)3 with a particle size of ~70 and ~200 nm, respectively. At higher temperatures and treatment times (190°C and 24 h), the particle size of these phases increases to ~200 and ~500 nm, respectively. For the first time, the value of the optical band gap for (NH4)2Ce(PO4)2⋅H2O was determined to be 2.8 and 3.1 eV for indirect and direct transitions, respectively.

Keywords

phosphates, REE, cerium, hydrothermal treatment

References

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